Fireproof wall board



Patented Sept. 29, 1925.

STATES 1,555,555 PAT/ENT oFFlcE.

Jenn conm-mn, or Nnw Yonx, N. Y., Assreuron 'ro nnssrn n. KENNEDY, or LARGH- MoNr, NEW Yoan.

FIREPROOF WALL BOARD.

Application nled September 2,2, 1921.

To all whom t may concern Be it known that I, JOHN COMERMA, a subfV ject of the King of Spain, and resident of' New York, in the county of New York and State of New York, have invented certain Inew and useful Improvements in Fireproof Wall Board, of which the following is a specification.'

The inventlon relates Vto the construction material known as ireproof wall board,`

ample, material similar to thatof the cover-` ing, the same extending in both directions over a seam and in the one direction, preferably, also to the corresponding edge ofthe board.

The nature of the invention, however, will best be understood when described in connection with the accompanying drawings, in which- Fig. 1 is a transverse section thru a length of board.

Figs. 2 to 4 are similar views illustrating modications.

Similar characters of reference designate corresponding parts thruout the several views.

Referring to the drawings, 10 designates thev body material, such as plaster of Paris, which is applied in plastic condition in manner well understood in the art. The plaster is designed to be held between the covering material 11 which may consist of sheets of material as cardboard or the equivalent and is brought over the both side edges, as shown, to make a continuous and unbroken front and side portions. The edges may be brought together; but it is preferred to introduce .an intermediate strip 12 between same and running lengthwise of the board over the back thereof. t

opening while allowing of the simple man- Serial' No. 502,373.

i ner aforesaid'of applying the covering 11,

which at the same time'aifords suitably protected edges. The portion ofthe board in proximity to the longitudinal seams 13 is, or this purpose, reinforced by a further longitudinal strip or strips 14 of suitable material as cardboard or-material similar' to the covering l1, the same vbeing arranged to extend for an appreciable distance upon.

either side of a seam, for example within the body material 10, as shown in Fig. 1, and in proximity to the bounding material of the back. Or, the bounding material maybe displaced inwardly for a distance from the edges, as shown in Fig. 2, and the reinforcing strip 14.1ooated on the outside thereof and flush' with the back surface.

Further modifications in the mounting of a strip 14` are illustrated in Figs. 3 and 4 where a portion of the reinforcing strip 14 is located within and the remainder without the bounding material, passing thru the seam thereof, Fig. 4, showing the mounting in the reverse position from that shown'in Fig. 3.

It is preferred, also, to reduce the crosssection Iof the board fora short distance inwardly along the sides, so that an overlapping by plaster finishing material at the joints of successive sheets may be effected. The'covering material 11 assists the securing of the sheets in affording nail holdingv material of a fibrous nature; In this connectior, the corresponding portion of a strip 14 is directed toward thereduced section so as `to extend therein substantially to the side edge and thus provide additional nail holding material and at the same time serve also 4to reinforce the portion of reduced cross-section. It will be appreciated that the fibrous material of the back of the board is the portion taking the tension stresses and that by the use of the strip "14 additional tensile strength is afforded the back, particularly at the portion of reduced crosssection. rlhe strip 14, moreover, securely binds the two separated cover portions together in a very substantial manner by reason of the large cohesive surface provided.

Furthermore, bringing the covering material over both ofthe side edges allows of the more simple manufacture of the board and thru the use of the back strip 12 between the edges of the covering, the registry of the covering material and back strip need not be so accurate-1y effected as the einforcing strips 14 will' serve to cover same as well as prevent the seams formed from opening.

A Well board of the character described, comprising a body portion of suitable material, of reduced cross-section along the edges and provided with a continuous covering materiel over the front, seid edges and e e medew portion of the beck, further covering meteiiei over the vfree space of the back, and stzips of materiel extending for an epprecieble distance upon both sides of the seams formed thereby on the back and in one direction substemtieliy to the correspending edge of the board.

Signed at New York, in the county of New York and State of New York, this 2l 20 dey of September, A. D. 1921. v

JHN CMERMA. 

